I see something wrong. I have a non-Inbox folder set to be checked for new mail with the timed interval set to 1m. Idle is disabled. With another tb instance I copy an unread mail to that folder. I see the STATUS check on the folder occur every minute in IMAP:5 log like it should and the server reports an increase in the number of messages but tb is ignoring it. Only after I select the folder (mouse over or click-on) is the new mail detected and reported via bold unread count and pop-up notification. This is on linux and without the related changes I've recently proposed with bug 1708981. Research continuing...
Bug 1725911 Comment 6 Edit History
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I see something wrong. I have a non-Inbox folder set to be checked for new mail with the timed interval set to 1m. Idle is disabled. With another tb instance I copy an unread mail to that folder. I see the STATUS check on the folder occur every minute in IMAP:5 log like it should and the server reports an increase in the number of messages but tb is ignoring it. Only after I select the folder (mouse over or click-on) is the new mail detected and reported via bold unread count and pop-up notification. This is on linux and without the related changes I've recently proposed with bug 1708981. Research continuing... Edit: I actually saw the new unread account appear in bold when the folder imap STATUS is checked. Just didn't see the notification pop-up. See more in comment 7.